U.S. patent number 11,285,871 [Application Number 16/815,736] was granted by the patent office on 2022-03-29 for method and system of controlling interior sound of vehicle.
This patent grant is currently assigned to HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION. The grantee listed for this patent is HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION. Invention is credited to Won Seop Choi, Seong Youn Kwak, Dong Wook Lee, Sang Il Lee, Jae Hyun Park.
United States Patent |
11,285,871 |
Kwak , et al. |
March 29, 2022 |
Method and system of controlling interior sound of vehicle
Abstract
A system for controlling an interior sound of a vehicle
phase-changes the frequency of additional sound based on the engine
operating state to increase the current density, thereby inhibiting
signal distortion by increasing the current density. As a result,
the distortion phenomenon caused by excessive use of amplifier
current when generating the additional sound is reduced or
minimized, and unnecessary noise is inhibited from occurring in a
vibration generator and a frame of the vehicle.
Inventors: |
Kwak; Seong Youn (Hwaseong-si,
KR), Park; Jae Hyun (Suwon-si, KR), Lee;
Dong Wook (Hwaseong-si, KR), Lee; Sang Il
(Seongnam-si, KR), Choi; Won Seop (Anyang-si,
KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
HYUNDAI MOTOR COMPANY
KIA MOTORS CORPORATION |
Seoul
Seoul |
N/A
N/A |
KR
KR |
|
|
Assignee: |
HYUNDAI MOTOR COMPANY (Seoul,
KR)
KIA MOTORS CORPORATION (Seoul, KR)
|
Family
ID: |
75269039 |
Appl.
No.: |
16/815,736 |
Filed: |
March 11, 2020 |
Prior Publication Data
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|
|
Document
Identifier |
Publication Date |
|
US 20210114519 A1 |
Apr 22, 2021 |
|
Foreign Application Priority Data
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|
|
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Oct 17, 2019 [KR] |
|
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10-2019-0129424 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B60Q
9/00 (20130101); G10K 15/02 (20130101); G10K
15/04 (20130101); H04R 2499/13 (20130101); H04R
3/04 (20130101) |
Current International
Class: |
B60Q
9/00 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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10-2018-0031668 |
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Mar 2018 |
|
KR |
|
Primary Examiner: Adnan; Muhammad
Attorney, Agent or Firm: Lempia Summerfield Katz LLC
Claims
What is claimed is:
1. A method of controlling an interior sound of a vehicle, the
method being configured to transmit an additional sound
corresponding to an engine sound and an exhaust sound of the
vehicle to an interior of the vehicle, and the method comprising:
analyzing, by a controller, a plurality of orders having different
frequencies based on an engine operating state, wherein the order
is a frequency component that generates vibration exciting force
based on an engine speed; applying, by the controller, a pre-stored
correction phase signal to the plurality of orders; and
synthesizing, by the controller, the plurality of orders applied
with the pre-stored correction phase signal to output a drive
signal for generating the additional sound, wherein applying the
pre-stored correction phase signal comprises: grouping, by
obtaining frequency data of the plurality of orders, the plurality
of orders into at least one group based on whether a period of a
signal waveform coincides with a period of at least one respective
order among the plurality of orders; and applying the pre-stored
correction phase signal to the at least one group including the at
least one respective order, wherein synthesizing the plurality of
orders comprises: synthesizing the at least one respective order
for the at least one group to which the pre-stored correction phase
signal is applied, wherein a phase of the pre-stored correction
phase signal is set by the at least one group such that a maximum
current amplitude and a minimum current amplitude of a frequency
band based on the at least one respective order by the at least one
group are less than or equal to a preset current value, and wherein
the pre-stored correction phase signal derives the maximum current
amplitude and the minimum current amplitude by deriving a value at
which a derivative coefficient becomes zero in the frequency band
according to at least one order among the plurality of orders, and
derives the maximum current amplitude and the minimum current
amplitude as a phase value that is less than or equal to the preset
current value.
2. The method of claim 1, wherein applying the pre-stored
correction phase signal comprises: grouping the plurality of orders
in which maximum common divisors of the frequencies corresponding
to the plurality of orders are coincided with each other.
3. The method of claim 1, wherein in synthesizing the plurality of
orders, a predetermined gain value is applied to output the drive
signal for the additional sound after synthesizing the at least one
respective order for the at least one group.
4. A system for controlling an interior sound of a vehicle, the
system being configured to transmit an additional sound
corresponding to an engine sound and an exhaust sound of the
vehicle to an interior of the vehicle, and the system comprising: a
sound module configured to transmit the additional sound based on
an engine operating state; and a controller configured to: control
the additional sound of the sound module, analyze a plurality of
orders with different frequencies based on the engine operating
state, wherein the order is a frequency component that generates
vibration exciting force based on an engine speed, apply a
pre-stored correction phase signal to the plurality of orders, and
synthesize the plurality of orders to which the pre-stored
correction phase signals are applied so as to output a drive signal
for generating the additional sound, thereby allowing the sound
module to transmit the additional sound as the drive signal,
wherein applying the pre-stored correction phase signal comprises:
grouping, by obtaining frequency data of the plurality of orders,
the plurality of orders into at least one group based on whether a
period of a signal waveform coincides with a period of at least one
respective order among the plurality of orders; and applying the
pre-stored correction phase signal to the at least one group
including the at least one respective order, wherein synthesizing
the plurality of orders comprises: synthesizing the at least one
respective order for the at least one group to which the pre-stored
correction phase signal is applied, wherein a phase of the
pre-stored correction phase signal is set by the at least one group
such that a maximum current amplitude and a minimum current
amplitude of a frequency band based on the at least one respective
order by the at least one group are less than or equal to a preset
current value, and wherein the pre-stored correction phase signal
derives the maximum current amplitude and the minimum current
amplitude by deriving a value at which a derivative coefficient
becomes zero in the frequency band according to at least one order
among the plurality of orders, and derives the maximum current
amplitude and the minimum current amplitude as a phase value that
is less than or equal to the preset current value.
5. The system of claim 4, wherein the controller is configured to:
enable periods of signals for the at least one group including the
at least one respective order to be coincident, and divide the
periods of signals into a plurality of groups.
6. The system of claim 4, wherein after synthesizing the at least
one respective order for the at least one group, the controller is
configured to apply a predetermined gain value to output the drive
signal for the additional sound.
Description
CROSS REFERENCE TO RELATED APPLICATION
This application claims priority to Korean Patent Application No.
10-2019-0129424, filed on Oct. 17, 2019, the entire contents of
which are incorporated herein by reference.
FIELD
The present disclosure relates to a method and system of
controlling an interior sound of a vehicle.
BACKGROUND
The statements in this section merely provide background
information related to the present disclosure and may not
constitute prior art.
Recently, the continuous development of new technology for domestic
and overseas electric and hybrid vehicles are under way.
Accordingly, since the driver does not recognize the driving
feeling while driving the vehicle, there is a problem that an
accident may occur. Accordingly, electric and hybrid vehicles have
a minimum noise standard when driving.
Moreover, besides electric and hybrid vehicles, even in a normal
vehicle, an additional driving sound is generated, along with the
engine sound and exhaust sound, to create a sporty driving feeling
at a high speed.
In order to separately generate the driving sound, the engine
speed, engine torque, vehicle speed, and position of the
accelerator pedal are analyzed and the driving sound in the
interior of the vehicle is generated through a vibration generator
according to a driving state of the vehicle.
Such a vibration generator is provided with an amplifier to
increase the power of a signal. However, we have discovered that a
phenomenon occurs wherein the electric current is distorted in a
specific region due to the characteristics of the amplifier.
In other words, when the driving sound is generated, a digital
signal is generated according to a given situation by an algorithm
according to the driving state, and a process is performed such
that the digital signal is converted into an analog signal, and the
output signal of the analog signal is amplified according to the
actual current. We have found that when the vehicle enters a high
RPM region, a phenomenon of distortion occurs due to excessive use
of the amplifier current, and a harmonic component is generated,
thereby causing unnecessary noise in the vibration generator and
the frame of the vehicle.
The foregoing is intended merely to aid in the understanding of the
background of the present disclosure, and is not intended to mean
that the present disclosure falls within the purview of the related
art that is already known to those skilled in the art.
SUMMARY
The present disclosure provides a method and system for controlling
an interior sound of a vehicle. In particular, the method and
system are configured to reduce or minimize a phenomenon of
distortion that may occur due to excessive use of an amplifier
current when an additional sound is generated, thereby inhibiting
or preventing a vibration generator and a frame of the vehicle from
generating unnecessary noise.
In one form of the present disclosure, a method of controlling an
interior sound of a vehicle, the method being configured to
transmit an additional sound corresponding to an engine sound and
an exhaust sound of the vehicle to the interior of the vehicle,
includes: analyzing, by a controller, a plurality of orders having
different frequencies based on an engine operating state; applying,
by the controller, a pre-stored correction phase signal to orders
of the plurality of orders; and synthesizing, by the controller,
the orders applied with the pre-stored correction phase signal to
output a drive signal for generating the additional sound.
In one form, applying the pre-stored correction phase signal may
include: grouping, among the plurality of orders, orders based on
whether a period of a signal waveform according to a frequency
coincides with the order; and applying pre-stored correction phase
signals to respective groups of the orders.
In another form, applying the pre-stored correction phase may
include: grouping the orders in which maximum common divisors of
the frequencies corresponding to the orders are coincided with each
other.
In other form, synthesizing the orders may include synthesizing the
orders for each group to which the pre-stored correction phase
signal is applied.
Phases of the pre-stored correction phase signals may be set by
each group such that a maximum current amplitude and a minimum
current amplitude of a frequency band based on the orders by each
group are less than or equal to a preset current value.
The pre-stored correction phase signal may derive the maximum
current amplitude and the minimum current amplitude by deriving a
value at which a derivative coefficient becomes zero in the
frequency band according to some orders among the plurality of
orders, and may derive the maximum current amplitude and the
minimum current amplitude as a phase value that is less than or
equal to the preset current value.
In one form, in synthesizing the orders, a predetermined gain value
is applied to output a drive signal for the additional sound after
synthesizing the orders for each group.
In one aspect of the present disclosure, a system for controlling
interior sound of a vehicle, the system being configured to
transmit an additional sound corresponding to an engine sound and
an exhaust sound of the vehicle to the interior of the vehicle, may
include: a sound module configured to transmit the additional sound
based on an engine operating state; and a controller configured to
control the additional sound of the sound module. In particular,
the controller analyzes a plurality of orders with different
frequencies based on the engine operating state, applies a
pre-stored correction phase signal to orders among the plurality of
orders, and synthesizes the orders of the plurality of orders to
which the pre-stored correction phase signals are applied so as to
output a drive signal for generating the additional sound, thereby
allowing the sound module to transmit the additional sound as the
drive signal.
The controller may group, among the plurality of orders, orders
based on the frequencies, and may apply the pre-stored correction
phase signals to respective groups of the orders.
The controller may group the orders in which the periods are
coincident according to the frequencies, and may divide the signal
periods into a plurality of groups.
The controller may synthesize the orders for each group to which
the pre-stored correction phase signal is applied.
The pre-stored correction phase signal may be a phase set by each
group so that a maximum current amplitude and a minimum current
amplitude of a frequency band is less than or equal to a preset
current value when synthesizing the orders for each group.
The controller, after synthesizing the orders for each group, may
apply a predetermined gain value to output the drive signal for the
additional sound.
In the method and system of controlling the interior sound of the
vehicle with a structure as described above, the method and system
may phase-change the frequency of an additional sound according to
an engine operating state to increase current density, thereby
inhibiting or preventing signal distortion due to the increase in
the current density. As a result, the present disclosure may
efficiently suppress occurrence of the distortion phenomenon caused
by excessive use of the amplifier current when generating the
additional sound, thus preventing unnecessary noise from occurring
in the vibration generator and the frame of the vehicle.
Further areas of applicability will become apparent from the
description provided herein. It should be understood that the
description and specific examples are intended for purposes of
illustration only and are not intended to limit the scope of the
present disclosure.
DRAWINGS
In order that the disclosure may be well understood, there will now
be described various forms thereof, given by way of example,
reference being made to the accompanying drawings, in which:
FIGS. 1 and 2 are flowcharts illustrating a method of controlling
interior sound of a vehicle;
FIG. 3 is a view illustrating frequencies according to an engine
speed;
FIGS. 4 and 5 are graphs illustrating phases for explaining the
method of controlling interior sound of the vehicle shown in FIG.
1;
FIG. 6 is a flowchart illustrating a method of controlling interior
sound of the vehicle in FIG. 1; and
FIG. 7 is a schematic diagram of a system of controlling an
interior sound of the vehicle.
The drawings described herein are for illustration purposes only
and are not intended to limit the scope of the present disclosure
in any way.
DETAILED DESCRIPTION
The following description is merely exemplary in nature and is not
intended to limit the present disclosure, application, or uses. It
should be understood that throughout the drawings, corresponding
reference numerals indicate like or corresponding parts and
features.
Hereinafter, with reference to the accompanying drawings, according
to an exemplary form of the present disclosure, the method and
system for controlling interior sound of a vehicle is
described.
FIGS. 1 and 2 are flowcharts illustrating a method of controlling
interior sound of a vehicle according to one form of the present
disclosure, and FIGS. 3 to 6 are views for explaining the method of
controlling interior sound of the vehicle shown in FIG. 1, and FIG.
7 is a schematic diagram of a system of controlling an interior
sound of the vehicle according to one form of the present
disclosure.
As shown in FIGS. 1 to 3, the method of controlling the interior
sound for the vehicle includes: a confirmation step S10 of
analyzing a plurality of orders of magnitude having different
frequencies obtained according to an engine operating state; a
correction step S20 of applying a pre-stored correction phase
signal to one or more orders out of the plurality of orders; and an
output step S30 of synthesizing the plurality of orders to which
the correction phase signal is applied and outputting the orders as
a drive signal for generating additional sound.
In one form, in order to generate the additional sound
corresponding to the engine sound and the exhaust sound in the
interior of the vehicle, a loudspeaker may be provided, which emits
sound similar to the engine sound or the exhaust sound by an
electrical signal according to the operating state of the
engine.
The present disclosure is to reduce or minimize the phenomenon that
the current is distorted by characteristics of the amplifier that
generates the electrical signal to the loudspeaker that generates
the additional sound. To this end, a micro controller unit (MCU)
receives a controller area network (CAN) signal according to the
engine operating state and generates a sound waveform according to
the situation by a preset algorithm, and a digital analogue
converter (DAC) converts a digital signal according to the sound
waveform into an analog signal, and the analog signal is amplified
for actual current by an amplifier (AMP). Here, a current
distortion phenomenon occurs due to the amplifier's own
characteristics, and the present disclosure reduces a harmonic
component caused by the distortion phenomenon to solve the problems
of generating rattle noise.
In detail, the confirmation step S10 is performed, in which a
plurality of orders are analyzed, which have different frequencies
according to an engine operating state. Here, the engine operating
state may be an engine speed (RPM) and an engine load, and this
step analyzes a change of an engine frequency according to the
engine speed. Also, the order is a frequency component that
generates vibration exciting force based on the engine speed. For
example, as shown in FIG. 3, orders C2, C3 . . . C (n) are set
according to engine frequencies depending on the engine speed, and
different frequencies are analyzed for each order. That is, in the
confirmation step S10, the order according to the engine speed is
stored in advance, and the frequency is analyzed for each order.
The order may be set according to the characteristics of the
speaker and the amplifier as well as the specification of the
engine, and the frequency according to the order may be derived and
stored in advance.
In this way, when a plurality of orders are analyzed through the
confirmation step S10, a correction step S20 is performed, in which
a correction phase signal is applied, which is pre-stored for one
or more orders. That is, the current may be reduced in the
frequency band by applying a pre-stored correction phase signal to
frequencies according to the plurality of orders.
Here, in the correction step S20, the plurality of orders may be
grouped into orders in which periods of synthesized signals
according to the frequencies coincide with the orders, and by each
group, the pre-stored correction phase signals may be applied.
Subsequently, the output step S30 may synthesize the order by each
group to which the correction phase signal is applied through the
correction step S20.
For this reason, each of the correction phase signal may be applied
to the plurality of orders, but a storage space is greatly required
when storing all the correction phase signals corresponding to the
respective orders. Therefore, it is desirable that the orders are
grouped so that the period of the synthesized signal according to
frequency coincides with the plurality of orders, and the
correction phase signal is applied to each group.
In the above-described correction step S20, the signal periods of
the respective groups may be coincident, and thus, may be divided
into the plurality of groups. In this way, it is possible to derive
an optimization value by the application and synthesis of the
correction phase signals just in the case where the orders is
coincident with the periods according to the frequencies, when
grouping the orders. Accordingly, when grouping the orders, the
periods are to be coincident.
Thus, when the plurality of orders are grouped so that the periods
of the synthesized signals according to the frequencies coincide
and the correction phase signals are applied to each group, the
frequency shape by each group remains the same, and the amplitudes
of the maximum current and the minimum current of the frequency
band at the time of the synthesis may be adjusted. In this way, in
the present disclosure, it is possible to prevent the distortion
phenomenon caused by excessive current of the amplifier by
adjusting the current amplitude of the frequency.
Meanwhile, in the correction phase signal, a phase may be set by
each group so that the maximum current amplitude and the minimum
current amplitude of the frequency band is less than or equal to
the preset current value when combining the orders by each group.
Here, the preset current value is to prevent the distortion
phenomenon of the current to avoid the generation of the rattle
noise, and the preset current value may be determined through
experiments in advance.
In detail, the correction phase signal for the frequency obtained
according to the order is to find a position where a derivative
coefficient (slope) becomes zero at a frequency (sine waveform
graph) obtained according to each order to derive the maximum
current amplitude and the minimum current amplitude. At this time,
when deriving the correction phase signal, by deriving a value
wherein the derivative coefficient is 0 in the frequency band
according to some of the plurality of orders, without checking the
frequencies for every order, only a fraction may be used to derive
the maximum current amplitude and minimum current amplitude that
may be groupable respectively.
In other words, a derivative of f(t)=A sin(2.pi.f.sub.1t)+B
sin(2.pi.f.sub.2t)+C sin(2.pi.f.sub.3t) assuming three orders
yields a value of
f'(t)=A(2.pi.f.sub.1)cos(2.pi.f.sub.1t)+B(2.pi.f.sub.2)cos(2.pi.-
f.sub.2t)+C(2.pi.f.sub.3)sin(2.pi.f.sub.3t), thereby deriving a
value of f'(t)=0. Where A is the maximum amplitude, f is the
frequency, and t is the time.
Through this, it is possible to derive the maximum current
amplitude and the minimum current amplitude by using some values
over time without checking all frequencies, and in this
calculation, some values may be utilized over time within a
period.
Using this calculation, the correction phase signal may be derived
through the following equation.
.function..times..times..function..times..pi..times..times..times..times.-
.times..times..times..pi..times..times..function..times..pi..times..times.-
.times..times..times..times..times..pi..times..times..function..times..pi.-
.times..times..times..times..times..times..times..pi.
##EQU00001##
This equation may be differentiated as follows.
'.function..function..times..pi..times..times..times..function..times..pi-
..times..times..times..times..times..times..times..pi..function..times..pi-
..times..times..times..function..times..pi..times..times..times..times..ti-
mes..times..times..pi..function..times..pi..times..times..times..function.-
.times..pi..times..times..times..times..times..times..times..pi.
##EQU00002##
Here, the phase may be a phase signal, and a phase signal for
correction may be obtained by deriving a phase that is included in
the preset current value while f'(t) is 0.
That is, as shown in FIG. 4, when there are groups A, B, and C that
do not coincide in periods, it may be seen that the current of the
waveform in which each group is synthesized exceeds the current of
1A, which is an appropriate value of the amplifier characteristics,
to reach the current of 2A. Meanwhile, as shown in FIG. 5, when
applying the correction phase signal corresponding to the group B
and C, the present disclosure may show that the current of the
waveform synthesizing respective groups is 1A or less. In this way,
when the correction phase signal is applied to each group, the
current density per hour is increased, thereby reducing or
minimizing the distortion of the current according to the
characteristics of the amplifier by using this corresponding
principle.
Referring to FIGS. 4 and 5, the frequency and correction phase
signal based on each group are exemplary and may be applied to
various values in consideration of various factors.
Meanwhile, after synthesizing the orders for each group, the output
step S30 may apply a predetermined gain value to output the drive
signal for the additional sound. This step is to output the drive
signal of the loudspeaker for the additional sound output, and
after synthesizing the orders of each group, the amplifier output
value may be derived by multiplying the gain value with the
synthesized signals.
Here, the gain value is based on the driving conditions of the
vehicle, and an application of the gain value aims to form an
additional sound identical to the engine sound according to various
driving conditions in consideration of RPM, engine torque, vehicle
speed, and the like. Due to this reason, the additional sound
suitable for the driving conditions of the vehicle may be output
through the loudspeaker depending on the output value of the
amplifier.
As shown in FIG. 6, in one form of the present disclosure as
described above, the control method of the present disclosure is as
follows.
In one form, the method performs a step S11 of collecting
information according to the engine operating state. This step
enables the MCU to receive engine operation state information such
as engine speed (RPM) and engine load from various sensors as a CAN
signal, and generates a sound waveform depending on a situation by
a preset algorithm.
Thereafter, a digital signal may be converted into an analog signal
through the DAC, and a grouping step S12 is performed on the basis
of the frequency data obtained according to a plurality of orders.
In this case, each group may group the orders in which periods of
synthesized signals according to the frequency coincide with each
other, and a step S21 of applying respective correction phase
signals to each group is performed. In FIG. 3, it is assumed that
there are three groups and correction phase signals corresponding
to each group, and it may be seen that step S22 of applying each
correction phase signal is performed for each group.
In this way, when the correction phase is applied to each group,
step S31 of synthesizing respective groups to which the correction
phase signals are applied is performed, and then step S32 of
applying the gain value after synthesizing respective groups are
performed. In this way, as the gain value is applied, the step S33
of outputting the drive signal for the additional sound is
performed, so that the additional sound may be generated through
the sound module as the final output drive signal.
Meanwhile, as shown in FIG. 7, in the system of controlling the
interior sound of the vehicle for transmitting the additional sound
corresponding to the engine sound and exhaust sound of the vehicle,
the system of controlling the interior sound of the vehicle
includes: a sound module 10 for transmitting additional sound
according to the engine operating state; and a controller 20,
wherein the controller is provided to control the additional sound
of the sound module 10, and by analyzing multiple orders with
different frequencies according to engine operating conditions, and
by synthesizing a plurality of orders to which the pre-stored
correction phase signal and the correction phase signal are applied
for one or more of the orders among the plurality of the orders, a
drive signal for generating additional sound is output, thereby
allowing the sound module to transmit additional sound as the drive
signal.
Here, the sound module 10 may be a loudspeaker that generates
additional sound by generating vibration according to the engine
operating state. The controller 20 may be provided with a MCU which
receives a signal input according to an engine operating state and
generates a sound waveform according to a situation by a preset
algorithm, a DAC for converting a digital signal according to a
sound waveform into an analog signal, and an amplifier that
amplifies the analog signal to actual current. Also, the controller
20 is configured to perform control of the sound module 10.
In other words, since the controller 20 analyzes the orders
according to the engine operating state, and performs the phase
change to apply the pre-stored correction phase signal for each
order, the waveform of the frequency is generated below a
predefined current, thereby increasing the current density and
avoiding the rattle noise problem.
Here, the controller 20 groups a plurality of orders in which the
periods of the synthesized signals according to the frequencies
coincide. At this time, the controller 20 may be divided into a
plurality of groups so that the signal period of each group is
coincident, and may apply the pre-stored correction phase signal
for each group. Here, the frequency according to the plurality of
orders and the grouping by the frequency may be performed by the
controller 20, and may be derived in advance and stored in the
controller 20. Thereafter, the controller 20 may synthesize the
orders for each group to which the correction phase signals are
applied.
Here, the phase signal preset by the controller 20 may be set by
each group for the phase in which the maximum current amplitude and
the minimum current amplitude of the frequency band is less than or
equal to the preset current value when synthesizing the orders for
each group.
In addition, the controller 20 may output the drive signal for the
additional sound by applying a preset gain value after synthesizing
the orders for each group.
Due to this reason, the additional sound suitable for the driving
conditions of the vehicle may be output through the loudspeaker
depending on the output value of the amplifier.
The controller 20 according to an exemplary form of the present
disclosure may be implemented through a nonvolatile memory (not
shown) configured to store data relating to an algorithm developed
to control operation of various components of the vehicle or
software instructions for reproducing the algorithm and a processor
(not shown) configured to perform the operations described below
using data stored in the memory. Here, the memory and the processor
may be implemented as separate chips. In the alternative, the
memory and the processor may be implemented as a single chip
integrated with each other. The processor may take a configuration
having one or more processors.
For controlling the interior sound of the vehicle having a
structure as described above, the method and system may
phase-change the frequency of additional sound according to an
engine operating state to increase the current density, thereby
preventing signal distortion from occurring by increasing the
current density. As a result, the distortion phenomenon caused by
excessive use of the amplifier current when generating the
additional sound is reduced or minimized, and unnecessary noise is
inhibited or prevented from occurring in the vibration generator
and the frame of the vehicle.
As described above, the present disclosure has been described with
reference to the particular exemplary forms. However, those skilled
in the art will appreciate that various modifications, additions
and substitutions are possible, without departing from the scope
and spirit of the present disclosure.
* * * * *